USB - looks like a straight USB lead, like you'd use for a printer.. flat end into the USB port on the computer.. square end into the bit on the back of the BR marked 'USB'..
Line Out - The audio out of the BR is standard RCA or 'Phono' connectors (the red and white bits).. same as any hi-fi separates would use. Should be piss easy to plug it into any amp.
You should also have 2 x 1/4" jack inputs for mics on the back, a mini-jack line in on the back (probably stereo), and a 1/4" jack input for an expression pedal.
There's also an additional 1/4" jack instrument in on the front for plugging your guitar or bass straight in for recording..
Al